Implement user authentication service with FastAPI and SQLite

2025-05-17 16:53:52 +00:00 · 2025-05-17 16:53:52 +00:00 · ec714bf9f0
commit ec714bf9f0
parent bd2605e275
31 changed files with 1338 additions and 2 deletions
--- a/README.md
+++ b/README.md
@ -1,3 +1,165 @@
-# FastAPI Application
+# User Authentication Service

-This is a FastAPI application bootstrapped by BackendIM, the AI-powered backend generation platform.
+A FastAPI-based user authentication service with JWT token authentication, user management, and token refresh functionality.
+
+## Features
+
+- User registration and login
+- JWT token-based authentication
+- Token refresh mechanism
+- User profile management
+- Admin user management
+- SQLite database with Alembic migrations
+
+## Technology Stack
+
+- **Framework**: FastAPI
+- **Database**: SQLite with SQLAlchemy ORM
+- **Migrations**: Alembic
+- **Authentication**: JWT (JSON Web Tokens)
+- **Password Hashing**: Bcrypt
+- **Dependency Management**: pip
+
+## Getting Started
+
+### Prerequisites
+
+- Python 3.8+
+- pip (Python package manager)
+
+### Installation
+
+1. Clone the repository:
+   ```bash
+   git clone <repository-url>
+   cd userauthenticationservice-altocj
+   ```
+
+2. Install dependencies:
+   ```bash
+   pip install -r requirements.txt
+   ```
+
+3. Run database migrations:
+   ```bash
+   alembic upgrade head
+   ```
+
+4. Start the development server:
+   ```bash
+   uvicorn main:app --reload
+   ```
+
+The API will be available at http://localhost:8000.
+API documentation is available at http://localhost:8000/docs or http://localhost:8000/redoc.
+
+## Project Structure
+
+```
+app/
+├── api/
+│   └── v1/
+│       ├── endpoints/
+│       │   ├── auth.py        # Authentication routes
+│       │   └── users.py       # User management routes
+│       └── router.py          # API router configuration
+├── core/
+│   ├── config.py              # Application configuration
+│   ├── database.py            # Database connection setup
+│   ├── dependencies.py        # Dependency injection
+│   └── security.py            # Authentication utilities
+├── models/
+│   ├── token.py               # Token database model
+│   └── user.py                # User database model
+├── schemas/
+│   ├── message.py             # Response message schemas
+│   ├── token.py               # Token validation schemas
+│   └── user.py                # User validation schemas
+├── services/
+│   ├── token.py               # Token service functions
+│   └── user.py                # User service functions
+└── utils/                     # Utility functions
+migrations/                    # Alembic migration files
+main.py                        # Application entry point
+requirements.txt               # Project dependencies
+```
+
+## Authentication Flow
+
+### Registration
+
+1. Client sends a POST request to `/api/v1/auth/register` with email, username, and password
+2. Server validates the request data
+3. If the user doesn't already exist, it creates a new user with a hashed password
+4. Server returns an access token and a refresh token
+
+### Login
+
+1. Client sends a POST request to `/api/v1/auth/login` with username/email and password
+2. Server authenticates the user
+3. If successful, server returns an access token and a refresh token
+
+### Authentication
+
+1. Client includes the access token in the Authorization header for protected endpoints:
+   ```
+   Authorization: Bearer {access_token}
+   ```
+
+2. Server validates the token and identifies the user
+
+### Token Refresh
+
+1. When the access token expires, client sends a POST request to `/api/v1/auth/refresh` with the refresh token
+2. Server validates the refresh token and issues a new access token and refresh token
+3. The old refresh token is revoked
+
+### Logout
+
+1. Client sends a POST request to `/api/v1/auth/logout` with the refresh token
+2. Server revokes the refresh token, invalidating the session
+
+### Logout All Sessions
+
+1. Client sends a POST request to `/api/v1/auth/logout-all` with a valid access token
+2. Server revokes all refresh tokens for the user, invalidating all sessions
+
+## API Endpoints
+
+### Authentication
+
+- `POST /api/v1/auth/register` - Register a new user
+- `POST /api/v1/auth/login` - Login with username/email and password
+- `POST /api/v1/auth/refresh` - Refresh access token
+- `POST /api/v1/auth/logout` - Logout (revoke refresh token)
+- `POST /api/v1/auth/logout-all` - Logout from all devices
+
+### User Management
+
+- `GET /api/v1/users/me` - Get current user profile
+- `PUT /api/v1/users/me` - Update current user profile
+- `GET /api/v1/users` - Get all users (admin only)
+- `POST /api/v1/users` - Create a new user (admin only)
+- `GET /api/v1/users/{user_id}` - Get user by ID (admin or self)
+- `PUT /api/v1/users/{user_id}` - Update user by ID (admin only)
+
+### Health Check
+
+- `GET /health` - Check API health status
+
+## Environment Variables
+
+The project uses `.env` file for configuration. Here's an example:
+
+```
+SECRET_KEY=your-secret-key
+ACCESS_TOKEN_EXPIRE_MINUTES=1440  # 24 hours
+BACKEND_CORS_ORIGINS=["http://localhost:3000"]
+```
+
+## Security Considerations
+
+- Passwords are hashed using bcrypt
+- JWT tokens are signed with a secret key
+- Refresh tokens are stored in the database and can be revoked
+- Role-based access control for admin functions
--- a/alembic.ini
+++ b/alembic.ini
@ -0,0 +1,102 @@
+# A generic, single database configuration.
+
+[alembic]
+# path to migration scripts
+script_location = migrations
+
+# template used to generate migration files
+# file_template = %%(rev)s_%%(slug)s
+
+# sys.path path, will be prepended to sys.path if present.
+# defaults to the current working directory.
+prepend_sys_path = .
+
+# timezone to use when rendering the date within the migration file
+# as well as the filename.
+# If specified, requires the python-dateutil library that can be
+# installed by adding `alembic[tz]` to the pip requirements
+# string value is passed to dateutil.tz.gettz()
+# leave blank for localtime
+# timezone =
+
+# max length of characters to apply to the
+# "slug" field
+# truncate_slug_length = 40
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+# set to 'true' to allow .pyc and .pyo files without
+# a source .py file to be detected as revisions in the
+# versions/ directory
+# sourceless = false
+
+# version location specification; This defaults
+# to migrations/versions.  When using multiple version
+# directories, initial revisions must be specified with --version-path.
+# The path separator used here should be the separator specified by "version_path_separator" below.
+# version_locations = %(here)s/bar:%(here)s/bat:migrations/versions
+
+# version path separator; As mentioned above, this is the character used to split
+# version_locations. The default within new alembic.ini files is "os", which uses os.pathsep.
+# If this key is omitted entirely, it falls back to the legacy behavior of splitting on spaces and/or commas.
+# Valid values for version_path_separator are:
+#
+# version_path_separator = :
+# version_path_separator = ;
+# version_path_separator = space
+version_path_separator = os  # Use os.pathsep. Default configuration used for new projects.
+
+# the output encoding used when revision files
+# are written from script.py.mako
+# output_encoding = utf-8
+
+sqlalchemy.url = sqlite:////app/storage/db/db.sqlite
+
+
+[post_write_hooks]
+# post_write_hooks defines scripts or Python functions that are run
+# on newly generated revision scripts.  See the documentation for further
+# detail and examples
+
+# format using "black" - use the console_scripts runner, against the "black" entrypoint
+# hooks = black
+# black.type = console_scripts
+# black.entrypoint = black
+# black.options = -l 79 REVISION_SCRIPT_FILENAME
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S
--- a/app/init.py
+++ b/app/init.py
--- a/app/api/init.py
+++ b/app/api/init.py
--- a/app/api/v1/init.py
+++ b/app/api/v1/init.py
--- a/app/api/v1/endpoints/init.py
+++ b/app/api/v1/endpoints/init.py
--- a/app/api/v1/endpoints/auth.py
+++ b/app/api/v1/endpoints/auth.py
@ -0,0 +1,173 @@
+from datetime import timedelta
+from typing import Any
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordRequestForm
+from sqlalchemy.orm import Session
+
+from app.core.config import settings
+from app.core.database import get_db
+from app.core.dependencies import get_current_active_user
+from app.core.security import create_access_token
+from app.models.user import User
+from app.schemas.token import Token, TokenRefresh
+from app.schemas.user import UserCreate
+from app.services import token as token_service
+from app.services import user as user_service
+
+router = APIRouter()
+
+
+@router.post("/register", response_model=Token)
+def register(
+    user_in: UserCreate,
+    db: Session = Depends(get_db),
+) -> Any:
+    """
+    Register a new user and return access token
+    """
+    # Check if user with this email already exists
+    user = user_service.get_by_email(db, email=user_in.email)
+    if user:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="A user with this email already exists",
+        )
+    
+    # Check if user with this username already exists
+    user = user_service.get_by_username(db, username=user_in.username)
+    if user:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="A user with this username already exists",
+        )
+    
+    # Create new user
+    user = user_service.create(db, obj_in=user_in)
+    
+    # Create access token
+    access_token_expires = timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
+    access_token = create_access_token(
+        subject=user.id, expires_delta=access_token_expires
+    )
+    
+    # Create refresh token
+    refresh_token_obj = token_service.create_refresh_token(db, user_id=user.id)
+    
+    return {
+        "access_token": access_token,
+        "token_type": "bearer",
+        "refresh_token": refresh_token_obj.token,
+        "expires_at": refresh_token_obj.expires_at,
+    }
+
+
+@router.post("/login", response_model=Token)
+def login(
+    db: Session = Depends(get_db),
+    form_data: OAuth2PasswordRequestForm = Depends(),
+) -> Any:
+    """
+    OAuth2 compatible token login, get an access token for future requests
+    """
+    user = user_service.authenticate(
+        db, username_or_email=form_data.username, password=form_data.password
+    )
+    if not user:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Incorrect username/email or password",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+    
+    if not user_service.is_active(user):
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Inactive user",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+    
+    # Create access token
+    access_token_expires = timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
+    access_token = create_access_token(
+        subject=user.id, expires_delta=access_token_expires
+    )
+    
+    # Create refresh token
+    refresh_token_obj = token_service.create_refresh_token(db, user_id=user.id)
+    
+    return {
+        "access_token": access_token,
+        "token_type": "bearer",
+        "refresh_token": refresh_token_obj.token,
+        "expires_at": refresh_token_obj.expires_at,
+    }
+
+
+@router.post("/refresh", response_model=Token)
+def refresh_token(
+    token_in: TokenRefresh,
+    db: Session = Depends(get_db),
+) -> Any:
+    """
+    Refresh access token
+    """
+    refresh_token = token_service.get_by_token(db, token=token_in.refresh_token)
+    if not refresh_token:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Invalid refresh token",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+    
+    if not token_service.is_token_valid(refresh_token):
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Refresh token expired or revoked",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+    
+    # Revoke the used refresh token
+    token_service.revoke_token(db, refresh_token)
+    
+    # Create new access token
+    access_token_expires = timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
+    access_token = create_access_token(
+        subject=refresh_token.user_id, expires_delta=access_token_expires
+    )
+    
+    # Create new refresh token
+    new_refresh_token = token_service.create_refresh_token(db, user_id=refresh_token.user_id)
+    
+    return {
+        "access_token": access_token,
+        "token_type": "bearer",
+        "refresh_token": new_refresh_token.token,
+        "expires_at": new_refresh_token.expires_at,
+    }
+
+
+@router.post("/logout", status_code=status.HTTP_204_NO_CONTENT, response_model=None)
+def logout(
+    token_in: TokenRefresh,
+    db: Session = Depends(get_db),
+) -> None:
+    """
+    Logout by revoking the refresh token
+    """
+    refresh_token = token_service.get_by_token(db, token=token_in.refresh_token)
+    if refresh_token:
+        token_service.revoke_token(db, refresh_token)
+    return None
+
+
+@router.post("/logout-all", status_code=status.HTTP_204_NO_CONTENT, response_model=None)
+def logout_all(
+    current_user: User = Depends(get_current_active_user),
+    db: Session = Depends(get_db),
+) -> None:
+    """
+    Logout from all devices by revoking all refresh tokens
+    """
+    token_service.revoke_all_user_tokens(db, user_id=current_user.id)
+    return None
--- a/app/api/v1/endpoints/users.py
+++ b/app/api/v1/endpoints/users.py
@ -0,0 +1,124 @@
+from typing import Any, List
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+
+from app.core.database import get_db
+from app.core.dependencies import (
+    get_current_active_superuser,
+    get_current_active_user,
+)
+from app.models.user import User
+from app.schemas.user import User as UserSchema
+from app.schemas.user import UserCreate, UserUpdate
+from app.services import user as user_service
+
+router = APIRouter()
+
+
+@router.get("/me", response_model=UserSchema)
+def read_user_me(
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Get current user
+    """
+    return current_user
+
+
+@router.put("/me", response_model=UserSchema)
+def update_user_me(
+    *,
+    db: Session = Depends(get_db),
+    user_in: UserUpdate,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Update own user
+    """
+    user = user_service.update(db, db_obj=current_user, obj_in=user_in)
+    return user
+
+
+# Admin endpoints
+@router.get("/", response_model=List[UserSchema])
+def read_users(
+    db: Session = Depends(get_db),
+    skip: int = 0,
+    limit: int = 100,
+    current_user: User = Depends(get_current_active_superuser),
+) -> Any:
+    """
+    Retrieve users. Only for superusers.
+    """
+    users = user_service.get_multi(db, skip=skip, limit=limit)
+    return users
+
+
+@router.post("/", response_model=UserSchema)
+def create_user(
+    *,
+    db: Session = Depends(get_db),
+    user_in: UserCreate,
+    current_user: User = Depends(get_current_active_superuser),
+) -> Any:
+    """
+    Create new user. Only for superusers.
+    """
+    user = user_service.get_by_email(db, email=user_in.email)
+    if user:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="A user with this email already exists",
+        )
+    
+    user = user_service.get_by_username(db, username=user_in.username)
+    if user:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="A user with this username already exists",
+        )
+    
+    user = user_service.create(db, obj_in=user_in)
+    return user
+
+
+@router.get("/{user_id}", response_model=UserSchema)
+def read_user_by_id(
+    user_id: int,
+    current_user: User = Depends(get_current_active_user),
+    db: Session = Depends(get_db),
+) -> Any:
+    """
+    Get a specific user by id
+    """
+    user = user_service.get_by_id(db, user_id=user_id)
+    if user == current_user:
+        return user
+    if not user_service.is_superuser(current_user):
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="The user doesn't have enough privileges",
+        )
+    return user
+
+
+@router.put("/{user_id}", response_model=UserSchema)
+def update_user(
+    *,
+    db: Session = Depends(get_db),
+    user_id: int,
+    user_in: UserUpdate,
+    current_user: User = Depends(get_current_active_superuser),
+) -> Any:
+    """
+    Update a user. Only for superusers.
+    """
+    user = user_service.get_by_id(db, user_id=user_id)
+    if not user:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="User not found",
+        )
+    user = user_service.update(db, db_obj=user, obj_in=user_in)
+    return user
--- a/app/api/v1/router.py
+++ b/app/api/v1/router.py
@ -0,0 +1,7 @@
+from fastapi import APIRouter
+
+from app.api.v1.endpoints import auth, users
+
+api_router = APIRouter()
+api_router.include_router(auth.router, prefix="/auth", tags=["authentication"])
+api_router.include_router(users.router, prefix="/users", tags=["users"])
--- a/app/core/init.py
+++ b/app/core/init.py
--- a/app/core/config.py
+++ b/app/core/config.py
@ -0,0 +1,42 @@
+from typing import List, Union
+from pathlib import Path
+from pydantic import AnyHttpUrl, validator
+from pydantic_settings import BaseSettings
+
+class Settings(BaseSettings):
+    API_V1_STR: str = "/api/v1"
+    PROJECT_NAME: str = "User Authentication Service"
+    PROJECT_DESCRIPTION: str = "API service for user authentication"
+    PROJECT_VERSION: str = "0.1.0"
+    
+    # Secret key for JWT token and other security mechanisms
+    SECRET_KEY: str = "YOUR_SUPER_SECRET_KEY_CHANGE_THIS_IN_PRODUCTION"
+    # 60 minutes * 24 hours * 8 days = 8 days in minutes
+    ACCESS_TOKEN_EXPIRE_MINUTES: int = 60 * 24 * 8
+    
+    # CORS
+    BACKEND_CORS_ORIGINS: List[AnyHttpUrl] = []
+
+    @validator("BACKEND_CORS_ORIGINS", pre=True)
+    def assemble_cors_origins(cls, v: Union[str, List[str]]) -> Union[List[str], str]:
+        if isinstance(v, str) and not v.startswith("["):
+            return [i.strip() for i in v.split(",")]
+        elif isinstance(v, (list, str)):
+            return v
+        raise ValueError(v)
+    
+    # Database
+    DB_DIR: Path = Path("/app/storage/db")
+    SQLALCHEMY_DATABASE_URL: str = f"sqlite:///{DB_DIR}/db.sqlite"
+    
+    # Token related
+    TOKEN_URL: str = f"{API_V1_STR}/auth/login"
+    
+    class Config:
+        case_sensitive = True
+        env_file = ".env"
+
+# Create the DB directory if it doesn't exist
+Settings().DB_DIR.mkdir(parents=True, exist_ok=True)
+
+settings = Settings()
--- a/app/core/database.py
+++ b/app/core/database.py
@ -0,0 +1,22 @@
+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+
+from app.core.config import settings
+
+engine = create_engine(
+    settings.SQLALCHEMY_DATABASE_URL,
+    connect_args={"check_same_thread": False}  # Only needed for SQLite
+)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+Base = declarative_base()
+
+# Dependency to get the database session
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
--- a/app/core/dependencies.py
+++ b/app/core/dependencies.py
@ -0,0 +1,71 @@
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from jose import jwt
+from pydantic import ValidationError
+from sqlalchemy.orm import Session
+
+from app.core.config import settings
+from app.core.database import get_db
+from app.core.security import ALGORITHM
+from app.models.user import User
+from app.schemas.token import TokenPayload
+from app.services import user as user_service
+
+# OAuth2 scheme for token authentication
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl=settings.TOKEN_URL)
+
+
+def get_current_user(
+    db: Session = Depends(get_db), token: str = Depends(oauth2_scheme)
+) -> User:
+    """
+    Get current user based on JWT token
+    """
+    try:
+        payload = jwt.decode(
+            token, settings.SECRET_KEY, algorithms=[ALGORITHM]
+        )
+        token_data = TokenPayload(**payload)
+    except (jwt.JWTError, ValidationError):
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Could not validate credentials",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+    
+    user = user_service.get_by_id(db, user_id=token_data.sub)
+    if not user:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="User not found"
+        )
+    return user
+
+
+def get_current_active_user(
+    current_user: User = Depends(get_current_user),
+) -> User:
+    """
+    Get current active user
+    """
+    if not user_service.is_active(current_user):
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Inactive user"
+        )
+    return current_user
+
+
+def get_current_active_superuser(
+    current_user: User = Depends(get_current_active_user),
+) -> User:
+    """
+    Get current active superuser
+    """
+    if not user_service.is_superuser(current_user):
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="The user doesn't have enough privileges"
+        )
+    return current_user
--- a/app/core/security.py
+++ b/app/core/security.py
@ -0,0 +1,42 @@
+from datetime import datetime, timedelta
+from typing import Any, Optional, Union
+
+from jose import jwt
+from passlib.context import CryptContext
+
+from app.core.config import settings
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+ALGORITHM = "HS256"
+
+
+def create_access_token(
+    subject: Union[str, Any], expires_delta: Optional[timedelta] = None
+) -> str:
+    """
+    Create JWT access token for the given subject
+    """
+    if expires_delta:
+        expire = datetime.utcnow() + expires_delta
+    else:
+        expire = datetime.utcnow() + timedelta(
+            minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES
+        )
+    to_encode = {"exp": expire, "sub": str(subject)}
+    encoded_jwt = jwt.encode(to_encode, settings.SECRET_KEY, algorithm=ALGORITHM)
+    return encoded_jwt
+
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    """
+    Verify if the plain password matches the hashed one
+    """
+    return pwd_context.verify(plain_password, hashed_password)
+
+
+def get_password_hash(password: str) -> str:
+    """
+    Hash a password for storing
+    """
+    return pwd_context.hash(password)
--- a/app/models/init.py
+++ b/app/models/init.py
@ -0,0 +1,5 @@
+from app.models.user import User
+from app.models.token import Token
+
+# Add all models here so they can be imported from app.models
+__all__ = ["User", "Token"]
--- a/app/models/token.py
+++ b/app/models/token.py
@ -0,0 +1,15 @@
+from sqlalchemy import Column, ForeignKey, Integer, String, DateTime, Boolean
+from sqlalchemy.sql import func
+
+from app.core.database import Base
+
+
+class Token(Base):
+    __tablename__ = "tokens"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
+    token = Column(String, unique=True, index=True, nullable=False)
+    expires_at = Column(DateTime(timezone=True), nullable=False)
+    is_revoked = Column(Boolean, default=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
--- a/app/models/user.py
+++ b/app/models/user.py
@ -0,0 +1,18 @@
+from sqlalchemy import Boolean, Column, DateTime, Integer, String
+from sqlalchemy.sql import func
+
+from app.core.database import Base
+
+
+class User(Base):
+    __tablename__ = "users"
+
+    id = Column(Integer, primary_key=True, index=True)
+    email = Column(String, unique=True, index=True, nullable=False)
+    username = Column(String, unique=True, index=True, nullable=False)
+    hashed_password = Column(String, nullable=False)
+    full_name = Column(String, nullable=True)
+    is_active = Column(Boolean, default=True)
+    is_superuser = Column(Boolean, default=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
--- a/app/schemas/init.py
+++ b/app/schemas/init.py
@ -0,0 +1,18 @@
+from app.schemas.message import Message, HTTPValidationError, ResponseBase, ResponseData
+from app.schemas.token import Token, TokenPayload, TokenRefresh
+from app.schemas.user import User, UserCreate, UserInDB, UserUpdate
+
+# Add all schemas here so they can be imported from app.schemas
+__all__ = [
+    "User", 
+    "UserCreate", 
+    "UserInDB", 
+    "UserUpdate", 
+    "Token", 
+    "TokenPayload", 
+    "TokenRefresh",
+    "Message",
+    "HTTPValidationError",
+    "ResponseBase",
+    "ResponseData"
+]
--- a/app/schemas/message.py
+++ b/app/schemas/message.py
@ -0,0 +1,26 @@
+from typing import Any, Dict, List, Optional, Union
+
+from pydantic import BaseModel
+
+
+class Message(BaseModel):
+    detail: str
+
+
+class ValidationError(BaseModel):
+    loc: List[str]
+    msg: str
+    type: str
+
+
+class HTTPValidationError(BaseModel):
+    detail: List[ValidationError]
+
+
+class ResponseBase(BaseModel):
+    success: bool
+    message: str
+
+
+class ResponseData(ResponseBase):
+    data: Optional[Union[Dict[str, Any], List[Dict[str, Any]]]] = None
--- a/app/schemas/token.py
+++ b/app/schemas/token.py
@ -0,0 +1,20 @@
+from datetime import datetime
+from typing import Optional
+
+from pydantic import BaseModel
+
+
+class Token(BaseModel):
+    access_token: str
+    token_type: str = "bearer"
+    refresh_token: Optional[str] = None
+    expires_at: Optional[datetime] = None
+
+
+class TokenPayload(BaseModel):
+    sub: Optional[int] = None
+    exp: Optional[datetime] = None
+
+
+class TokenRefresh(BaseModel):
+    refresh_token: str
--- a/app/schemas/user.py
+++ b/app/schemas/user.py
@ -0,0 +1,39 @@
+from datetime import datetime
+from typing import Optional
+
+from pydantic import BaseModel, EmailStr
+
+
+class UserBase(BaseModel):
+    email: Optional[EmailStr] = None
+    username: Optional[str] = None
+    is_active: Optional[bool] = True
+    is_superuser: bool = False
+    full_name: Optional[str] = None
+
+
+class UserCreate(UserBase):
+    email: EmailStr
+    username: str
+    password: str
+
+
+class UserUpdate(UserBase):
+    password: Optional[str] = None
+
+
+class UserInDBBase(UserBase):
+    id: Optional[int] = None
+    created_at: Optional[datetime] = None
+    updated_at: Optional[datetime] = None
+
+    class Config:
+        orm_mode = True
+
+
+class User(UserInDBBase):
+    pass
+
+
+class UserInDB(UserInDBBase):
+    hashed_password: str
--- a/app/services/init.py
+++ b/app/services/init.py
--- a/app/services/token.py
+++ b/app/services/token.py
@ -0,0 +1,88 @@
+import secrets
+from datetime import datetime, timedelta
+from typing import Optional
+
+from jose import jwt, JWTError
+from sqlalchemy.orm import Session
+
+from app.core.config import settings
+from app.core.security import ALGORITHM
+from app.models.token import Token
+
+
+def create_refresh_token(
+    db: Session, *, user_id: int, expires_delta: Optional[timedelta] = None
+) -> Token:
+    """
+    Create a refresh token in the database
+    """
+    if expires_delta:
+        expire = datetime.utcnow() + expires_delta
+    else:
+        expire = datetime.utcnow() + timedelta(days=30)  # 30 days default
+    
+    # Generate a secure random token
+    token_value = secrets.token_urlsafe(64)
+    
+    # Create token in DB
+    db_token = Token(
+        user_id=user_id,
+        token=token_value,
+        expires_at=expire,
+        is_revoked=False
+    )
+    db.add(db_token)
+    db.commit()
+    db.refresh(db_token)
+    
+    return db_token
+
+
+def get_by_token(db: Session, token: str) -> Optional[Token]:
+    """
+    Get a token by its value
+    """
+    return db.query(Token).filter(Token.token == token).first()
+
+
+def is_token_valid(token: Token) -> bool:
+    """
+    Check if a token is valid (not expired and not revoked)
+    """
+    now = datetime.utcnow()
+    return token.expires_at > now and not token.is_revoked
+
+
+def revoke_token(db: Session, token: Token) -> Token:
+    """
+    Revoke a token
+    """
+    token.is_revoked = True
+    db.add(token)
+    db.commit()
+    db.refresh(token)
+    return token
+
+
+def revoke_all_user_tokens(db: Session, user_id: int) -> None:
+    """
+    Revoke all tokens for a user
+    """
+    tokens = db.query(Token).filter(Token.user_id == user_id).all()
+    for token in tokens:
+        token.is_revoked = True
+    
+    db.commit()
+
+
+def decode_token(token: str) -> Optional[dict]:
+    """
+    Decode a JWT token
+    """
+    try:
+        payload = jwt.decode(
+            token, settings.SECRET_KEY, algorithms=[ALGORITHM]
+        )
+        return payload
+    except JWTError:
+        return None
--- a/app/services/user.py
+++ b/app/services/user.py
@ -0,0 +1,111 @@
+from typing import Optional, List, Dict, Any, Union
+
+from sqlalchemy.orm import Session
+
+from app.core.security import get_password_hash, verify_password
+from app.models.user import User
+from app.schemas.user import UserCreate, UserUpdate
+
+
+def get_by_id(db: Session, user_id: int) -> Optional[User]:
+    """
+    Get a user by ID
+    """
+    return db.query(User).filter(User.id == user_id).first()
+
+
+def get_by_email(db: Session, email: str) -> Optional[User]:
+    """
+    Get a user by email
+    """
+    return db.query(User).filter(User.email == email).first()
+
+
+def get_by_username(db: Session, username: str) -> Optional[User]:
+    """
+    Get a user by username
+    """
+    return db.query(User).filter(User.username == username).first()
+
+
+def get_multi(
+    db: Session, *, skip: int = 0, limit: int = 100
+) -> List[User]:
+    """
+    Get multiple users with pagination
+    """
+    return db.query(User).offset(skip).limit(limit).all()
+
+
+def create(db: Session, *, obj_in: UserCreate) -> User:
+    """
+    Create a new user
+    """
+    db_obj = User(
+        email=obj_in.email,
+        username=obj_in.username,
+        hashed_password=get_password_hash(obj_in.password),
+        full_name=obj_in.full_name,
+        is_active=obj_in.is_active,
+        is_superuser=obj_in.is_superuser,
+    )
+    db.add(db_obj)
+    db.commit()
+    db.refresh(db_obj)
+    return db_obj
+
+
+def update(
+    db: Session, *, db_obj: User, obj_in: Union[UserUpdate, Dict[str, Any]]
+) -> User:
+    """
+    Update a user
+    """
+    if isinstance(obj_in, dict):
+        update_data = obj_in
+    else:
+        update_data = obj_in.dict(exclude_unset=True)
+    
+    if "password" in update_data and update_data["password"]:
+        hashed_password = get_password_hash(update_data["password"])
+        del update_data["password"]
+        update_data["hashed_password"] = hashed_password
+    
+    for field in update_data:
+        if field in update_data:
+            setattr(db_obj, field, update_data[field])
+    
+    db.add(db_obj)
+    db.commit()
+    db.refresh(db_obj)
+    return db_obj
+
+
+def authenticate(
+    db: Session, *, username_or_email: str, password: str
+) -> Optional[User]:
+    """
+    Authenticate a user by username/email and password
+    """
+    user = get_by_username(db, username=username_or_email)
+    if not user:
+        user = get_by_email(db, email=username_or_email)
+    if not user:
+        return None
+    if not verify_password(password, user.hashed_password):
+        return None
+    return user
+
+
+def is_active(user: User) -> bool:
+    """
+    Check if user is active
+    """
+    return user.is_active
+
+
+def is_superuser(user: User) -> bool:
+    """
+    Check if user is superuser
+    """
+    return user.is_superuser
--- a/app/utils/init.py
+++ b/app/utils/init.py
--- a/main.py
+++ b/main.py
@ -0,0 +1,34 @@
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from app.api.v1.router import api_router
+from app.core.config import settings
+
+app = FastAPI(
+    title=settings.PROJECT_NAME,
+    description=settings.PROJECT_DESCRIPTION,
+    version=settings.PROJECT_VERSION,
+    openapi_url=f"{settings.API_V1_STR}/openapi.json",
+    docs_url="/docs",
+    redoc_url="/redoc",
+)
+
+# Set all CORS enabled origins
+if settings.BACKEND_CORS_ORIGINS:
+    app.add_middleware(
+        CORSMiddleware,
+        allow_origins=[str(origin) for origin in settings.BACKEND_CORS_ORIGINS],
+        allow_credentials=True,
+        allow_methods=["*"],
+        allow_headers=["*"],
+    )
+
+app.include_router(api_router, prefix=settings.API_V1_STR)
+
+# Health check endpoint
+@app.get("/health", status_code=200)
+def health_check():
+    return {"status": "healthy"}
+
+if __name__ == "__main__":
+    import uvicorn
+    uvicorn.run("main:app", host="0.0.0.0", port=8000, reload=True)
--- a/migrations/README
+++ b/migrations/README
@ -0,0 +1,35 @@
+Generic single-database configuration with Alembic.
+
+For more information on Alembic, see:
+https://alembic.sqlalchemy.org/en/latest/
+
+To run migrations:
+1. Make sure you have alembic installed:
+   ```
+   pip install alembic
+   ```
+
+2. Run the upgrade to the latest version:
+   ```
+   alembic upgrade head
+   ```
+
+3. To create a new migration:
+   ```
+   alembic revision -m "description of changes"
+   ```
+
+4. To downgrade:
+   ```
+   alembic downgrade -1
+   ```
+
+5. To get current migration version:
+   ```
+   alembic current
+   ```
+
+6. To see migration history:
+   ```
+   alembic history
+   ```
--- a/migrations/env.py
+++ b/migrations/env.py
@ -0,0 +1,82 @@
+from logging.config import fileConfig
+
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+
+from alembic import context
+
+# Import models for Alembic
+from app.core.database import Base
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+target_metadata = Base.metadata
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+
+def run_migrations_offline() -> None:
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section, {}),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        is_sqlite = connection.dialect.name == 'sqlite'
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata,
+            render_as_batch=is_sqlite,  # Enable batch mode for SQLite
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()
--- a/migrations/script.py.mako
+++ b/migrations/script.py.mako
@ -0,0 +1,24 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}
--- a/migrations/versions/001_create_user_token_tables.py
+++ b/migrations/versions/001_create_user_token_tables.py
@ -0,0 +1,65 @@
+"""create user token tables
+
+Revision ID: 001
+Revises: 
+Create Date: 2023-10-10
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.sql import func
+
+
+# revision identifiers, used by Alembic.
+revision = '001'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # Create users table
+    op.create_table(
+        'users',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('email', sa.String(), nullable=False),
+        sa.Column('username', sa.String(), nullable=False),
+        sa.Column('hashed_password', sa.String(), nullable=False),
+        sa.Column('full_name', sa.String(), nullable=True),
+        sa.Column('is_active', sa.Boolean(), default=True),
+        sa.Column('is_superuser', sa.Boolean(), default=False),
+        sa.Column('created_at', sa.DateTime(timezone=True), server_default=func.now()),
+        sa.Column('updated_at', sa.DateTime(timezone=True), server_default=func.now(), onupdate=func.now()),
+        sa.PrimaryKeyConstraint('id')
+    )
+    
+    op.create_index(op.f('ix_users_id'), 'users', ['id'], unique=False)
+    op.create_index(op.f('ix_users_email'), 'users', ['email'], unique=True)
+    op.create_index(op.f('ix_users_username'), 'users', ['username'], unique=True)
+    
+    # Create tokens table
+    op.create_table(
+        'tokens',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('user_id', sa.Integer(), nullable=False),
+        sa.Column('token', sa.String(), nullable=False),
+        sa.Column('expires_at', sa.DateTime(timezone=True), nullable=False),
+        sa.Column('is_revoked', sa.Boolean(), default=False),
+        sa.Column('created_at', sa.DateTime(timezone=True), server_default=func.now()),
+        sa.ForeignKeyConstraint(['user_id'], ['users.id'], ondelete='CASCADE'),
+        sa.PrimaryKeyConstraint('id')
+    )
+    
+    op.create_index(op.f('ix_tokens_id'), 'tokens', ['id'], unique=False)
+    op.create_index(op.f('ix_tokens_token'), 'tokens', ['token'], unique=True)
+
+
+def downgrade() -> None:
+    op.drop_index(op.f('ix_tokens_token'), table_name='tokens')
+    op.drop_index(op.f('ix_tokens_id'), table_name='tokens')
+    op.drop_table('tokens')
+    
+    op.drop_index(op.f('ix_users_username'), table_name='users')
+    op.drop_index(op.f('ix_users_email'), table_name='users')
+    op.drop_index(op.f('ix_users_id'), table_name='users')
+    op.drop_table('users')
--- a/requirements.txt
+++ b/requirements.txt
@ -0,0 +1,11 @@
+fastapi==0.103.1
+uvicorn==0.23.2
+sqlalchemy==2.0.20
+alembic==1.12.0
+pydantic==2.3.0
+pydantic-settings==2.0.3
+passlib==1.7.4
+python-jose==3.3.0
+python-multipart==0.0.6
+bcrypt==4.0.1
+ruff==0.0.290